Pop stars and music icons, as impervious as they may seem, are not invincible. Whether due to an injury, illness or just because they desperately need to take a break for the sake of their own mental health, countless artists have been forced to pump the breaks and cancel or postpone massive national and world tours before.

Even stars like Adele, Justin Bieber, Kanye West and Britney Spears have had to cancel tour dates. Below, check out ten artists who cancelled their concert tours due to injuries, illness, tragic circumstances and other surprising reasons.

Artists Who Cancelled Their Concert Tours